I think this is only true in very specific circumstances. Ideological divide can also mean disowning your child for being gay, which is why among homeless youth there's a disproportionate amount of LGBTQ children and why the concept of "found families" is very relevant to the LGBTQ community. Certain families also will disown or withdraw from any member who doesn't follow religious teachings.

Often times ideological differences is quite meaningful when it results in the abuse/neglect of vulnerable family members.